Stockwell Elastomerics manufactures custom gaskets and pads using varied silicone rubber materials. Silicone is the frequent title used for polysiloxane polymers, together with VMQ, VMQ silicone, and VMQ rubber. As with many polymers, silicones are manufactured in numerous varieties to be used in a large number of industries; fluids, gels, resins and elastomers are just a few examples. Polysiloxane polymers in elastomer type are generally referred to as silicone rubber or VMQ.

Silicone Rubber as a Core Competence

The high performance properties of silicone elastomers are the reason it has become Stockwell Elastomerics’ core product family. Stockwell Elastomerics inventories silicone rubber sheets and silicone rolls which are readily converted into (custom gaskets and components. Stockwell Elastomerics also (injection molds liquid silicone rubber (LSR) and compression molds specialty silicones such as electrically conductive silicones and (fluorinated silicone (fluorosilicone).

Widespread Silicone Rubber Functions

Customized gaskets

Cushioning pads

Weather seals

Enclosure gaskets – IP gasket

– NEMA gasket

Silicone Rubber Basics

Silicone rubber (VMQ) is generally thought of inorganic, which means its spine is not made up of carbon. The Si-O-Si backbone of silicones are stronger, longer and more versatile than C-O bonds found in natural rubber supplies; this Si-O-Si backbone also accounts for silicone’s low glass transition temperature and stability in UV and ozone environments. Many commercially obtainable carbon based mostly elastomers, generally known as “black rubber”, degrade relatively shortly in outdoor environments as a operate of the weaker carbon bonds breaking down.

Silicone polymers can be formulated in some ways to boost key purposeful properties reminiscent of tear energy, elongation, compression set, and temperature range. If you have any kind of inquiries concerning where and how to utilize silicone products –,, you could call us at our own website. Custom compounds are formulated to add or improve silicone’s properties to meet finite useful requirements; these might embody electrically conductive fillers for EMI applications or ceramic fillers for thermal administration.

VMQ is the industry commonplace code for silicone rubber; the VM means vinyl methyl. VMQ silicone and VMQ rubber are other methods to consult with silicone rubber.

Properties – UV, ozone, long life, high energy return, and low compression set, extensive temperatureForms – solid liquid silicone rubber (LSR), solid gum, expanded foam, expand sponge, electrically conductive, thermally conductive

Two Main Silicone Rubber Families

Liquid silicone rubber (LSR) and high consistency rubber (HCR) are two families of silicone rubber. Liquid silicones are usually made from two half techniques which are blended and heat cured. LSRs may be forged into sheets or injection molded. HCRs are sometimes mixed and supplied to manufacturers in gum form to be compression molded or Silicone Products roto-cured into sheets.

Liquid Silicone Rubber (LSR)

– Lower durometer options

– Sooner molding cycles

– Decrease price for molded components

– Cleaner cure course of

High Consistency Rubber (HCR)

– Better mechanicals / tougher

– Wider temperature range

– Lower sheet cost

– Higher compression set resistance

Two Most typical Cure Methods

There are two main cure methods used with processing silicone: addition cure and peroxide cure. Addition cured silicones, typically platinum catalyzed, are often formulated to make clear, low extractable rubber that is utilized in medical devices or meals processing. Addition cure programs are generally associated with LSRs however are readily obtainable in HCRs as nicely.

Peroxide cure techniques use free radicals to catalyze the curing course of. Fairly often industrial grades of silicone rubber use peroxide curing system. Peroxide methods are most frequently related to HCRs.

Platinum Catalyzed Addition Curing

Peroxide Catalyzed Addition Curing

The above diagrams are courtesy of Wacker Silicones.

Manufacturing Parts from Silicone Rubber

Stockwell Elastomerics manufactures customized silicone gaskets and silicone parts using a multitude of processes. Quick turn gaskets are manufactured by waterjet slicing or die slicing pre-formed sheets. Silicone rubber sheets are available in solids, foam or closed cell sponge. 3D components could be liquid injection molded utilizing liquid silicone rubber (LSR) or compression molded from gum based high consistency rubber (HCR). Along with chopping and molding silicone, Stockwell Elastomerics laminates acrylic and silicone adhesives to pre-formed sheet before reducing. Other value added operations embrace software of conductive coating, customized meeting, and laminations of various supplies for enhancing the physical properties of materials.